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Amazon Kindle Fire's Silk browser sounds privacy alarm bells

"The real news isn't just another Android tablet though, it's
the new mobile browser Amazon introduced called Silk. Amazon has
crafted Silk to both increase the speed of mobile browsing and
increase battery life.

How does it work? Silk relies on the Amazon Elastic Compute
Cloud (EC2) to behave as an intelligent proxy. The concept is to
use the power of EC2 to retrieve web pages and pre-render any
objects (or reduce their size) in a way that lowers the burden
placed on the tablet.